Swelling of men’s private parts may be caused by urethritis, testicular torsion, trauma and other factors, the patient should promptly seek medical attention to clarify the cause of the disease and then carry out appropriate treatment. 1. Urethritis: gonococcus and other factors caused by inflammation of the urethra, the patient will have symptoms such as swelling of the private parts, urethra tingling, frequent urination, urinary urgency, urinary pain. 2. Testicular torsion: the swelling of the man’s private parts may also be caused by testicular torsion, the patient will also have testicular pain, nausea and vomiting and other symptoms. 3. Trauma: If a man has a history of collision before the occurrence of swelling in the private parts, it should be considered to be caused by trauma, need to ask whether there is a clear history of trauma. To summarize, it is recommended to consult a doctor in time to clarify the cause of the disease and to carry out targeted treatment.